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PCR Detection and Phylogenetic Analysis of Megalocytivirus Isolates in Farmed Giant Sea Perch Lates calcarifer in Southern Taiwan

1
Graduate Institute of Animal Vaccine Technology, College of Veterinary Medicine, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
2
Pingtung County Animal Disease Control Center, Pingtung 90001, Taiwan
3
International Degree Program of Animal Vaccine Technology, International College, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
*
Author to whom correspondence should be addressed.
Received: 5 June 2020 / Revised: 20 June 2020 / Accepted: 22 June 2020 / Published: 24 June 2020
(This article belongs to the Section Animal Viruses)
The Megalocytivirus genus includes three genotypes, red sea bream iridovirus (RSIV), infectious spleen and kidney necrosis virus (ISKNV), and turbot reddish body iridovirus (TRBIV), and has caused mass mortalities in various marine and freshwater fish species in East and Southeast Asia. Of the three genotypes, TRBIV-like megalocytivirus is not included in the World Organization for Animal Health (OIE)-reportable virus list because of its geographic restriction and narrow host range. In 2017, 39 cases of suspected iridovirus infection were isolated from fingerlings of giant sea perch (Lates calcarifer) cultured in southern Taiwan during megalocytivirus epizootics. Polymerase chain reaction (PCR) with different specific primer sets was undertaken to identify the causative agent. Our results revealed that 35 out of the 39 giant sea perch iridovirus (GSPIV) isolates were TRBIV-like megalocytiviruses. To further evaluate the genetic variation, the nucleotide sequences of major capsid protein (MCP) gene (1348 bp) from 12 of the 35 TRBIV-like megalocytivirus isolates were compared to those of other known. High nucleotide sequence identity showed that these 12 TRBIV-like GSPIV isolates are the same species. Phylogenetic analysis based on the MCP gene demonstrated that these 12 isolates belong to the clade II of TRBIV megalocytiviruses, and are distinct from RSIV and ISKNV. In conclusion, the GSPIV isolates belonging to TRBIV clade II megalocytiviruses have been introduced into Taiwan and caused a severe impact on the giant sea perch aquaculture industry. View Full-Text
Keywords: iridovirus; megalocytivirus; red sea bream iridovirus (RSIV); infectious spleen and kidney necrosis virus (ISKNV); turbot reddish body iridovirus (TRBIV); giant sea perch iridovirus (GSPIV); phylogenetic analysis; polymerase chain reaction (PCR) iridovirus; megalocytivirus; red sea bream iridovirus (RSIV); infectious spleen and kidney necrosis virus (ISKNV); turbot reddish body iridovirus (TRBIV); giant sea perch iridovirus (GSPIV); phylogenetic analysis; polymerase chain reaction (PCR)
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MDPI and ACS Style

Tsai, J.-M.; Huang, S.-L.; Yang, C.-D. PCR Detection and Phylogenetic Analysis of Megalocytivirus Isolates in Farmed Giant Sea Perch Lates calcarifer in Southern Taiwan. Viruses 2020, 12, 681. https://0-doi-org.brum.beds.ac.uk/10.3390/v12060681

AMA Style

Tsai J-M, Huang S-L, Yang C-D. PCR Detection and Phylogenetic Analysis of Megalocytivirus Isolates in Farmed Giant Sea Perch Lates calcarifer in Southern Taiwan. Viruses. 2020; 12(6):681. https://0-doi-org.brum.beds.ac.uk/10.3390/v12060681

Chicago/Turabian Style

Tsai, Jia-Ming, Song-Lang Huang, and Chung-Da Yang. 2020. "PCR Detection and Phylogenetic Analysis of Megalocytivirus Isolates in Farmed Giant Sea Perch Lates calcarifer in Southern Taiwan" Viruses 12, no. 6: 681. https://0-doi-org.brum.beds.ac.uk/10.3390/v12060681

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